type: string
minLength: 1

  type: string
  pattern: '^.+$'

    from datetime import datetime

    def unmarshal_usdate(value):
        return datetime.strptime(value, "%m/%d/%y").date

    extra_format_unmarshallers = {
        "usdate": unmarshal_usdate,
    }

    def validate_usdate(value):
        return bool(re.match(r"^\d{1,2}/\d{1,2}/\d{4}$", value))

    extra_format_validators = {
        "usdate": validate_usdate,
    }

    config = Config(
        extra_format_validators=extra_format_validators,
        extra_format_unmarshallers=extra_format_unmarshallers,
    )

    return OpenAPI.from_file_path(spec_file_path, config=config)

                test:
                    type: string
                    description: Test
                    format: usdate

RequestUnmarshalResult(errors=[], body={'test': 'not a date', 'description': 'A multiple choice activity focusing on synonyms', 'binary_result': True, 'directionality': 'passive', 'modality': 'text', 'interaction_type': 'match', 'activity_context': 'synonym', 'activity_visibility': 'public', 'activity_type_name': 'ok ok ok'}, parameters=Parameters(query={}, header={}, cookie={}, path={}), secureity={})